Help for Sizing

Hi, I’m new to the replica jersey world and I’m buying the France World Cup kits for my family and myself. I’m a bit stuck on the sizing part. I got the player‑version home kit for me, and I’ve heard you usually need to size up with the player version.

Since I’m not a big guy, I was wondering if I could still go with a size Small. For reference, I’m 170 cm tall, 55 kg, athletic and lean.

Do you think a Small would fit, or should I size up?
I'm buying with ADjersey.